A spiral turbulence suppression device for marine risers

A spiral type and standpipe technology, which is applied in the field of marine riser spiral turbulence suppression devices, can solve the problems of poor vibration suppression effect of omnidirectional vortex induced vibration, high design, manufacture and installation costs, and increased drag force of riser pipes. problems, to achieve the effects of good omnidirectional vibration suppression efficiency, easy processing and installation, and good resistance performance

Active Publication Date: 2022-03-04
TIANJIN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] In recent years, most vibration suppression devices with simple structures have unidirectional characteristics, and the vibration suppression effect on omnidirectional vortex-induced vibration is not good.
The omnidirectional restraint measures with complex structures have better performance, but the design, manufacture and installation costs are high, and it will cause an increase in the drag force of the standpipe, and there are problems such as dynamic instability, so it is difficult to be applied in engineering

Method used

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  • A spiral turbulence suppression device for marine risers
  • A spiral turbulence suppression device for marine risers
  • A spiral turbulence suppression device for marine risers

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Embodiment Construction

[0046] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0047] see figure 1 Referring to Fig. 4, the present invention provides a spiral turbulence suppression device for marine risers, including a riser 12;

[0048] The outer surface of the riser 12 is nested with successively connected multi-section riser sleeves 14 (not limited to figure 1 the three shown);

[0049] The outer surface of each riser sleeve 14 has three baffle sets 6 welded at equal intervals;

[0050] Each spoiler set 6 includes a plurality of spoilers 5 distributed in a spiral shape;

[0051] In each spoiler set 6 , the distance between any two adjacent spoilers 5 is equal.

[0052] In the present invention, the length of each riser sleeve 14 is 3 to 5 times the outer diameter of the standpipe 12;

[0053] The inner diamet...

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Abstract

The invention discloses a helical flow turbulence suppression device for a marine riser, which comprises a riser (12); the outer surface of the riser (12) is nested with a plurality of riser sleeves (14) connected in sequence; The riser sleeve (14) has three spoiler groups (6) welded at equal intervals; each spoiler group (6) includes a plurality of spoilers (5) distributed in a helical shape; each spoiler The distance between any two adjacent spoilers (5) in the flow sheet group (6) is equal. The invention discloses a spiral turbulence suppression device for marine risers, which can effectively suppress vortex-induced vibrations of marine risers, has the characteristics of good omnidirectional vibration suppression efficiency and good resistance performance, and has great practical significance .

Description

technical field [0001] The invention relates to the technical field of vibration suppression for marine risers, in particular to a spiral turbulence suppression device for marine risers. Background technique [0002] The riser is a connecting pipe used to connect the offshore platform and the subsea wellhead in the deep sea oil and gas development system. Except that the upper and lower ends of the standpipe are connected and fixed, the rest of the riser does not have any fixing and support. Therefore, when the sea current flows through the surface of the standpipe, at a certain flow rate, vortices are alternately formed on both sides of the standpipe, and the vortex shedding will produce a periodic variable force on the standpipe, causing the standpipe to vibrate in the vertical flow direction. Since the vortex will fall off with the wake of the ocean current fluid flow, when the vortex shedding frequency is close to the natural frequency of the standpipe, it will cause th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15D1/00E21B17/01
CPCF15D1/00E21B17/01
Inventor 杜尊峰吴俊凌张天仪范迪夏
Owner TIANJIN UNIV
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